Lock



Patented July 30, 1935 PATENT OFFICE LOCK Elmer B. Stone andIlouis M. Dyson, New Britain, Conn., assignorsto The American Hardware Corporation, New Britain, Conn., a corpora- V tion of Connecticut Application February 6, 1934, Serial Nc. 709,958 7 Claims. (o1 .r10'93) Our invention relates more particularly to that type of locks commonly known as pin tumbler locks, and an object of our invention, among others, is to provide a lock of this type which may be differently operated by different keys.

One form of a lock embodying our invention and in the construction and use of which the objects herein set out, as well as others, may be attained, is illustrated in the accompanying drawing, in which- Figure 1 is 'a side view of our improved lock.

Figure 2 is an end view of the same.

Figure 3 is a view looking at the opposite end of the lock from that shown in Figure 2.

Figure 4 is a view similar to Figure 3 but showing the plug in one position possible by the operation of one form of key.

Figure 5 is a similar view but showing the plug placed in another position by another fonn of key.

Figure G is a detail View on enlarged scale in central longitudinal section showing the, position of the pin tuinblers as placed by one key.

Figure '7 is a view in section with parts broken away and illustrating the position of the pin tumblers as placed by another form of key.

Figure 8 is a view in section on a plane denoted by the dotted line 8--8 of Figure 7.

Figure 9 is a view in cross-section on a plane denoted by the dotted line 9 9 of Figure '1.

Figure l0 is an isometric View partially in section illustrating the case and the locking sleeve therein.

Figure l1 is an isometric view partially in section illustrating the key plug and a portion of the locking sleeve. l

It is desirable to provide locks used in connection with various structures with means for operation by dierent keys, one key beinglimited in the results produced by its operationover the results produced by the use ofanother key, or one key eiectinT one purpose and another key effecting another purpose. A lock embodying these features is illustrated and described herein, the drawing representing a lock case I2 forV tumblers and a cylinder I3 for a key plug I4. The plug I4 is provided with a key slot I5 extending longitudinally through it, this slot being of any desired shape and form to permit the entrance of keys of diiierent shapes as common in lock structures of this type. Holes I6 are formed in a line extending lengthwise of the plug on one side, these holes being for the reception ofthe key engaging sections II of pin tumblers, said sections having rounded ends for engagement with notches I8 in a key I9 of one form usable with -my-improved lock.

A hub 2D is secured to the inner end of the plug projecting beyond the case S2 and said hub may have means for connection to mechanism for operating releasing mechanism as for drawers or other 'receptacles in a manner common to structures-cf this class and which will be readily understood by those skilled in the art without further detail description.`

A slotV 2i is formed in the plug near the front end thereof and within'the cylinder I3, said slot being for the purpose ofreceiving a stop 22 projecting from a locking sleeve 23, and as shown in Fig. 7 of the drawing.

This locking sleeve is fitted to the plug I 4 inside of a shoulder formed by a head 24 on the plug, the sleeve being preferably of a length equal to thelength of the cylinder I3 and' terminating at the shoulder formed by the reduced end of the plug upon which the hub 2B is secured. This sleeve has holes Z5 'to receive intermediate sections 25 of pin tumblers which rest against the key engaging sections Il, and as shown in Fig. 7. This sleeve is cut away at its inner end as at 21 forming shoulders at opposite ends of said cut that act as stops 28 to receive a stop pin 29 projecting inwardly from the inner wall of the cylinder'IS. y Y f The case I2 is formed with holes 3B to receive the inner vsections 3i or" pin tuinblers and springs 32 are seated against the sections 3| and against a closing plate 33 preferably of dove-tailed shape tting a slot in the wall of the case I2 and as Shown in Figs. 6 and 9 of the drawing. The springs press the tumbler sections toward the key, the rounded ends of the sections I'I resting against shoulders 34 formed at the entrance of the holes I6 into the key slot.

In the operation of the lock a key I9 being inserted therein the notches are so formed that the tumblers will be positioned with the inner ends of the key engaging sections all in lineat the line of separation 35 between the plug and the sleeve 23, and as shown in Fig. 6 of the drawing. This will enable the key to turn the plug I4 in a contra-clockwise direction and to the position shown in Fig. 4, in which position the stop pin 22 will prevent further movement. This operation will cause the plug to operate any desired mechanism to release any particular part which it is intended shall be unlocked, it being understood that in this operation the sleeve 23 is held against rotation by the intermediate sections of the tumblers projecting into the openings in the lock case.

When a key as 36A is inserted in the slot the notches are so formed that the tumblers will be positioned With the meeting ends between the intermediate sections 26 and the inner sections 3| on a line between the sleeve and the inner Wall of the case I2, and the plug may now be turned by the key in either direction until rotation is prevented by contact of the pin 29 With the stops 28. If the key be rotated contra-clockwise as in the case of the key I9 the same unlocking mechanism will be operated and if the key be turned in a. clockwise direction other mechanism for unlocking or releasing other parts of the structure will be operated.

It will now be seen that by the use of a key, as I9, the lock may be operated to attain only one result, as the opening of a certain drawer or compartment of a receptacle, whereas by the use of a key, as 36, the same result, as with the operation of the key I9, may be attained, and other results, as access to other compartments, may be effected, and it may also be noted that the stop 28 may be so arranged, if desired, that the key 36 may turn in one direction only, and opposite to that permitted by use of the key I9, in which case each key would be limited in use to attain a result diierent from that obtained by the use of the other key.

In accordance with the provisions of the patent statutes We have described the principles of operation of our invention, together With the device Which We now consider to represent the best embodiment thereof; but We desire to have it understood that Within the scope of the appended claims the device shown is only illustrative and that the invention may be carried out by other means and applied to uses other than those above set out.

We claim- 1. A lock including a cylinder with a key plug member therein, means for controlling rotation of said plug member, a sleeve member within which said plug is rotatably mounted, a stop projecting radially from one of said members into a slot in the other of said members to permit rotation of the plug in one direction only from its normally locked position by the use of a key, and means to permit rotation of said plug in an opposite direction from its normally locked position by the use of another key.

2. A lock including a cylinderwith a key plug rotatably moiuited therein, means for controlling rotation of said plug, a slot extending circumferentially Within the outer surface of said plug, a stop projecting radially from said sleeve into said slot to permit rotation of the plug in one direction only from its normally locked position by the use of a key, shoulders formed on said sleeve on opposite sides of a line extending diametrically across the sleeve, and a pin projecting from said cylinder into the path of movement of said shoulders.

3. A lock including a cylinder with a key plug therein, means for controlling rotation of said plug, a sleeve Within which said plug is rotatably mounted, a stop separate from said controlling means and projecting radially from said sleeve into a slot in said plug to permit rotation of the plug in one direction only from its normally locked position by the use of a key, and means to permit rotation of said plug in an opposite direction from its normally locked position by the use of another key.

4. A lock including a cylinder with a key plug therein, means for controlling rotation of said plug in said cylinder, a sleeve in said cylinder and Within which sleeve said plug is rotatably mounted, a stop projecting from said sleeve substantially at the opposite side thereof from said pin tumblers into a slot in said plug to permit rotation of the plugin one direction only from its normally locked position by the use of a key, and means for permitting rotation of said plug in opposite directions from its normally locked position by the use of another key.

5. A lock including a cylinder with a key plug therein, pin tumblers in said plug and cylinder to control rotation of the plug, a sleeve Within which said plug is rotatably mounted, a stop projecting from said sleeve substantially at the opposite side thereof from said pin tumblers into a slot in said plug to prevent its rotation in one direction from its usually locked position by the use of a key, said tumblers being arranged to prevent rotation of the sleeve in such rotation of the plug, and means to permit rotation of the sleeve and plug in an opposite direction by the use of another key.

6. A lock including a cylinder with a key plug therein, a sleeve in said cylinder and Within which said plug is rotatably mounted, pin tumblers having sections appurtenant to said cylinder, said sleeve and to said plug, a stop projecting from the sleeve into a slot in the plug to prevent its rotation in one direction from its normally locked position by the use of a key, means to position the tumblers to permit rotation of the plug in the sleeve, said tumblers being arranged to permit rotation of the sleeve in the cylinder by the use of another key.

7. A lock including a cylinder with a key plug therein, a sleeve in said cylinder and Within which said plug is rotatably mounted, a stop projecting from said sleeve into a slot in said plug to prevent its rotation in one direction from its normally locked position, pin tumblers having sections appurtenant to said cylinder, sleeve and plug, said tumblers being arranged to be positioned by a key to permit rotation of the plug in the sleeve, and said tumblers also being arranged to be positioned by another key to lock the plug to the sleeve and to permit rotation of the sleeve in the cylinder, and means for limiting the rotation of said sleeve in said cylinder.

ELMER B. STONE.

LOUIS M. DYSON. 

